NMR Calibration Using Software-Based Frequency Drift Compensation
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Solution Overview
Problem
Conventional nuclear magnetic resonance (NMR) systems, particularly small-scale systems, face significant challenges in mitigating frequency drift due to temperature changes, as temperature-controlled chambers are ineffective and add bulk to the system, and existing methods lack efficient calibration techniques.
Innovation Solution
A software-based calibration method is employed to adjust transmission parameters and correct for frequency drift, utilizing a magnet array, transmitter, and receiver to sample calibration and experiment measurements, with a focus on reducing delay and improving accuracy by using small tip angles and thermal regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature-controlled chambers are used to mitigate frequency drift, then frequency stability is improved, but system size and complexity increase
Solution Approach 1:
The patent replaces the mechanical/thermal system (temperature-controlled chambers) with a software-based calibration system that uses algorithms to detect and correct frequency drift through calibration measurements and parameter adjustments
Solution Approach 2:
The system dynamically adjusts transmission parameters based on calibration measurements to compensate for frequency drift, changing the operational parameters rather than the physical environment to maintain frequency stability
2Measurement precision
If conventional calibration methods are used, then system simplicity is maintained, but calibration accuracy deteriorates due to frequency drift
Solution Approach 1:
The system performs calibration measurements and determines reference frequencies before conducting experiment measurements, preparing the system in advance to compensate for frequency drift and improve measurement accuracy
Solution Approach 2:
The system uses calibration measurements as feedback to determine frequency drift and adjust transmission parameters, creating a closed-loop control system that continuously optimizes measurement accuracy
3Reliability
If delay between calibration and experiment measurements is reduced, then frequency drift impact is minimized, but system operation complexity increases
Solution Approach 1:
The system maintains continuous operation by seamlessly transitioning between calibration and experiment measurements, minimizing idle time and maintaining the measurement sequence without interruption to reduce frequency drift impact
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances calibration accuracy and reduces the impact of temperature-induced frequency shifts, enabling precise NMR measurements by minimizing delay and system size, thus improving the reliability of blood analyte level determination.
Implementation Method 1
a magnet array 100 configured to generate a magnetic field over a target region of the sample
Implementation Method 2
transmitting a first transmission (e.g., into a measurement volume)
Implementation Method 3
sampling a first measurement from a sample (e.g., a finger) in response to the first transmission
Data Source
AI summary
In variants, the system (e.g., a nuclear magnetic resonance system) can include: a magnet array, a housing, a transmitter, a receiver, and a processing system. In variants, the method can include: sampling a calibration measurement, determining a reference frequency based on the calibration measurement, and sampling an experiment measurement. The method can optionally include: processing the experiment measurement, determining an analyte level, and/or any other suitable steps.